#include <bits/stdc++.h>
#define NMAX 100005
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
vector<int>v[NMAX];
vector<int>sol[NMAX];
int d[NMAX];
int main()
{
    int n,m,x,y;
    fin>>n>>m;
    for(int i=1;i<=m;++i)
    {
        fin>>x>>y;
        v[x].push_back(y);
        d[y]++;
    }
    int ok=0,niv=0;
    do{
        niv++;
        ok=0;
        for(int i=1;i<=n;++i)
        if(d[i]==0) {
            sol[niv].push_back(i);
            ok=1;
            d[i]=-1;
        }
        for(vector <int> :: iterator it = sol[niv].begin(); it!=sol[niv].end();++it)
        {
            for(vector<int>::iterator fiu = v[*it].begin();fiu != v[*it].end();++fiu)
                d[*fiu]--;
        }
    }while(ok==1);
    for(int i=1;i<niv;++i)
    {
        for(auto x:sol[i])
            fout<<x<<" ";
    }
    return 0;
}